20. Solve: 5x^2 - 10x = 0

50. (x-1)(x^3 + x^2 + x) =?

Thanks
-MC

20. 5X^2-10X=0

5X(X-2)=0
5X=0, X=0
X-2=0, X=2
Solution set:x=0,and x=2.